creating an environment in which the two will be able to challenge one another. every detail here set for tonight, both campaigns flipping a coin. the president will be introduced first, he'll get the first question. the romney campaign winning the toss on closing arguments. governor romney will get the final word tonight. even a coin toss over the wives. mrs. romney will be introduced first. both wives playing the role of debate partner. mrs. romney telling cnn it's been her most important role during the campaign. >> it's a cute thing that he does, almost after every answer. he finds me in the audience. as soon as he gets on stage, the first thing he does is, he takes off his watch and puts it on the podium. but then he writes "dad." >> reporter: romney's father, the one-time michigan governor, who also ran for president. and the first lady acknowledging her own nerves. >> i get so nervous at these debates and, you know, i'm like one of those parents watching their kid on the balance beam. you just are standing there, trying not to, you know, have any expressio